Adjustable retainer device



Feb. 16, 1960 v s.BoRsVE1v'T| 925382 ADJUSTABLE RETAINER DEVICE Filed April 28, 1958 liable mild-steel chuckkjaws makes it possible yto I `and,accurately. ially v'v'here' theA ish Sylvain Bosseffitncelyleb #messala is' a ggd ir L ported therein yThe u efsu'chA e:y lathe. n re eas l first Yinserted intgghe Acylulkto tatqxise-glthe chuck rjaws. to n the blank is with# alteringtheirrelative "positions,` so as to impart to the vinner jaw surfaces annaccuratejcontour cr :responding l 45,

to thatof the blank. n 2:1-,

' The means heretofore usedvin'retainingthe chuck jaws in their setrelative. positions usually comprise anannular.v member provided with ,radial,1inwa'r 'dly directed screws adapted to engage the outer sides ofspindles insertedinto asa, all siriiilanfnd la'referallymade offstel. fir branches areinterpivotedto provide Jafdefrniable Alier;

, v 2,925,282 effe le wie be` described nwith reference tov Ihe'accompanfyingfcfa'awings, vvheein:A A. 'Fig'. l is' L'front View of 'a 'retainer device 'according t6 tli invention for maintaining the predetermined -rela-- thelike duringV rectification;

I: Fig'. 3' is `a Nfron't Vview of'a chuckwith the device 'f f Figsrl and 2 mounted thereon-'in deformed lcondition. 10

It Vwill be lunderstood tlla'it` th drawings and' r'elat'ed descriptive matter is illustrative 'rather than restrictive. ln the illustrated len'bodiment'-tleinvention is l` shown [als v'applied as arneans forfretainingwthe relative setting z of lathchuckiaws during aiming-'opration Adie chuck rings described*'fumerfnp" y Y The locking means herein Veach consist df Vaf'sdrvv fthe :adjacent gbranch'ad anutssc'r'wedfon the projecting en'd/QfjlS'idstudj l I ...jin o'rdei' :to rinsure tirfmer -rlocking `-of. the vssernblyfiii the ideformed setting,` engagingsrfa'ce between the nutl and 'the .adjacent bran'cbgof :the :assembly engaged .by fit', 'may :be-formed .to 'suitablextape'ed shape such fla irustomnic;alv shape as show nwineFig.` f2, .o r as 'La :portion o;f.aspher,e.f

It will be seen that with the nuts 5 loosened, the branches of the assembly may be freely manipulated to deform the. hexagon so `that theV radial distance between g the three studsY 2.- can be made'tofcorrespond to any de.- p sired value between Ya maximum'. and-a minimum. The

holes formed 1in`Y the jawsf parallel tothe YchuckV axis.' f

With such systems however'the positioning of the jaw-V retainer meansis inconvenient since it isrequired tor l maintain boththe annular memberrfand the spindles Vin y position. Moreover, owing tothe relatively small en"- gagementk area between the screw tips andthespindles, it is found difficult to setthe chuck: jaws accurately kto* the desired settings.Y Whereas the' depth of engagementl'rof the radial screws provides a means of adjusting .the

elective chuck diameter to the value .corresponding toV Aa .particular blank, this result cannot be achieved when Y using a simple or single annular ring member, andrmore complex means. Lave to Ybe used. An additionaldraw-n back of such retainer means is the factthat -itrconsists lof a plurality of independent rcomponents which/are aptr to becomel disassembled.

maximum spacing.V is obtained` when `the hexagon is Y 1 formed tothe shape of ai, regular hexagon as Yshown in Afull lines'jnk Fig. 1; .and `the .minimum spacing is Vhad when three VVapices, fof-.the hexagon. ,are touching one another. `flihe broken line lcontour .shown in Fig. 1

illustrates au intermediate vshape which-is rather` close V "to the minimumf'spacing condition..

VIn using thedevice described for the truing ofdthe jaws 7 of a lathe chuck 8 as shown in Fig, 3, the follow-V Y ing procedure may be used.

A hole or socket 9 is first formed'in the front face of.

. each of the .three chuck. jaws 7 in'a direction. parallel to the chuckaxis. The blank'll to be turned in theY `latheis inserted into the chuck and made fast. The. setting then vassumed by the usfual Vchuck'. key isapproxifYV mately indicated as withpa chalk markV in order to permit v.the same chuck setting to be restored later, and said` key Vis then backed a,predetermined.arnount,1e.g. two revolu- ,It is theV general object .of invention` to provideV Y adjustable retainer devicesjfforrv relatively 'movable v'rnechanical parts which will satisfyntheivarious required ments ofpractice more completely than heretoforef' j ".AneXemP1a.ry eaibediniutpt tions, in a direction to open,` the'chuck.V The blankY llfis then removed and the devicerof'the invention is fc'fof-Y nected with the chuck by engaging the .three locating vpins Zrespectively into the sockets 9 oflthe chuck; jaws,

Y Yit being understood that the'blocking nut'sf'S 'are atlthisj 'p i time in looseneclcon'dition. 'l`he'nuts5`arethen tighte operation.

and the chuck key is turned back to the position corresponding to the chalk mark, or preferably somewhat beyond, by an amount corresponding to the diierence between the diameter of blank 11 and the actual diameter of the chuck jaws after the truing operation, The chuck jaws are then bored to the desiredvdiameter. The nuts are then again loosened and theretainer device is'removed, Ywhereupon the blank 11 can be inserted and clamped in position for the desired turning It will be seen 'from the foregomg that thenovel device for retaining relatively movable mechanical parts in a predetermined relative position includes a number of advantages some of which are indicated as'follows:

It remains at all times in the form of a unitary assembly. It is foldable to a small-size condition. It is very easy and quick to position and remove. It acts to retain the parts in a strictly accurate relative setting.

While I have described herein some embodiments of my invention, I wish it to be understood that I do not intend to limit myself thereby except within the scope of the claims hereto or hereinafter appended.

Y What I claim is:

1. A device for temporarily retaining a plurality of relatively movable chuck jaws in a predetermined relative position, which comprises a plurality of interpivoted elements defining a Ydeformable po ygonal assembly having a number of apices equal to twice the number of said jaws, each, said jaws having a locating means provided thereon,fcooperating locating means Yformed on one sideof some Yofisaid elements interengageable with said locating means on said jaws, and locking means for locking said elements relatively to one another to retain said polygonal assembly in the deformed vcondition assumed thereby ,on interengagement-of said locating means. Y

2. A device for temporarily retaining a plurality of relatively movable chuck jaws ina predetermined relative position, .comprising aset of interpivoted elements.

detininga defromable polygonal assembly having a number of apices equal to twice the number of said jaws, each said jaw having a locating depression formed therein, locating pins projecting from one side of said assembly at every `other one of said apices interengageable with said respective depressions, and locking means associated with the remaining apices for locking said ele- `is a hexagonal assembly.v

ments relative to one another in a deformed condition assumed on interengagement of said locating pins and depressions.

3. A device of the type described for temporarily retaining a plurality of relatively movable chuck jaws in a predetermined relative position, comprising a set of interpivoted elements defining a deformable polygonal assembly having a numberrof apices Ytwice the number of said jaws, each said jaw having a locating depression formed therein, locating pins projecting Yfrom one side of said assembly at every other one of said apices interengageable with said respective depressions, and lockable screw means positioned at the remaining apices for locking the elements in a deformed condition assumed on interengagement of saidlocating pins and depressions.A

4. A device as claimed inclaim 3, including means for interpivoting said elements comprising pivot pins projecting beyond said one side of the assembly to define said locating pins.

5. A device as claimed in claim 3, including means for interpivoting said elementsl comprising rivet-like pins each having a head engaging one element and a shank freely extending through Asaid one element and forcetitted through vthe adjacent element and projecting lbveyond Saidadjacent element to provide a locrting pin.

6. A device as claimed in claim 3, wherein said blocking means comprisesra screw stud secured to one element and freely extendingV through the 'adjacentelemen and a nut screwedon the projecting end of said studgV 7. A device'according toclaim `3, whereinsaid elementshave enlarged end portions to provide increased frictional contact between adjacent elements.

n 8.. A device `according to `claim l,w.yhc`rein` thereA are three 'parts to. be retained, and said polygonal assembly 9. A device according to claimV l,6,7 wherein said` nut and said adjacent element havecoope'rating taper surfaces.

References Cited in the le of this patient UNITED STATES PATENTS 2,304,670 Argus Dec; s, 1942 2,464,070 Carcelli Mar. 8, 1949 FOREIGNv PATENTS 

